Incandescent-electric-lamp socket, lamp, and adapter therefor



July 3, 1928.

, 1,615,554 A. S. HOWELL INANDESCENT ELETRIC LAMP SOCKET,v LAMP, AND ADAPTER THEREFOR Eig-1 Filed Feb. 2:5, 1925 lo-l ///%////% Inl/if-- amm 6. Haw/z Bg# www,

Patented July 3, 1928.

UNITED STATES PATENT OFFICE.

ALBERT s. HOWELL, or CHICAGO, ILLINOIS, AssIGNOH To BELL a HOWELL COMPANY,

' OI' CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS. y

INCANDESCENT-ELECTBIC-LAMP SOCKET, LAMP, AND A DALPTEB THEBEFOB.

Application led February' 23, 1923. y Serial No. 620,821.

Oneof the features of my invention relates to an electric lamp socket and lamp particularly adapted for scicntil'i'c purposes, andwhich permits of the installation and removal of the lamp through the bottom of the socket and which is adapted for the accurate positioning of the lamp mounted in the socket.

Another feature of the invention relates to an adapter for incandescent electric lamp bases and the like for adapting the bases, such as the present day screw bases, to my invention.

With these features in view my invention consists in certain features of novelty in the construction, combination, and arrangement of parts by which vthe said features and certain other features hereinafter ap'- pearing are eifected, all as fully described with reference tol the accompanying drawings and more particularly pointed out in the claims.

In the said drawings- Figure 1 is acentral vertical section of thev lamp chamber of a motion picture machine equipped with a lamp and socket of my invention.

Figure 2 isa section taken on the line 2-2 of Fig. 1.

Figure 3 is a perspective view of the adapter of my invention, hereinaboveA referred to.

Like characters of reference indicate like parts in the several views. In Fig. 1 is shown a vertical cylindrical casing 1 which comprises the main portion of .the lampchamber shown, and secured to the lower end of this casing is the socket of my invention, now to be described, which forms the bottom ofthe lamp chamber.

A vbody 2 of suitable molded insulating material is secured against thebottom of the casing 1 in a usual manner, and has a large vertical bore 3 therethrough communicating with the enclosure of the lamp chamber, see

Figs 1 and 2. Molded in the body 2 and disposed coaxial with the bore of the body and intermediate the top and bottom there'- ofl is an annular metallic contact 4 which.

projects inwardly from the surface of' the bore 3 and forms a downwardly facing annular contact. Molded in the body 2 and disposed coaxial with the bore of the body and below the contact 4 and insulated there- 5 :from is an annular internally scrcwthrcadcd which engages the metallic conductor member '5. Removably screwthreaded into the 'conductor member and the free end of this blade is disposed centrally of the member 6. Secured on. the exterior surface of the member 6 is a member 8 of insulating material formed for convenient grasp for removing or mounting the member 6.

The contact 4 and the conductor member 5 are provided with extensions 9 extending through the body 2 to externally exposed points in recesses l1 formed in the external surface of the body. These extensions form terminals to which are attached wires 12 from a source of current by usual headed screws 13 screwthreaded into the extensions. CIhe lrecesses 11 are covered by a plate 14 of insulating material removably attached to the body 2 and'through apertures in which the wires 12 pass.

The contact 4 and conductor member 5 are adapted to have the body 15 of an incandescent elec-tric lamp passed upwardly through the bore 3.of the bod 2 and through the Openings in these mem ers 4` and 5 into the ase of the lamp is provided with a circumferential conductive contact 16 disposed normal to the axis of the lamp and extendin laterally beyond the body of the lamp an forming an upwardl facing contact surface Ownwardly facing contact surface of the contact 4 when the lamp is mounted in the socket. The lamp base is provided with a usual centrally disposed end contact 17- insulated from the contact 16, and the members 6 and 7 of the socket form an end contact for engagement with the en d contact of the lamp when the lamp is mounted in the socket. Removal of the end contact ofthe socket ermits removal Or installation ofthe lamp t rough the bot- `tom of the socket in an obvious manner, and when thc lamp is mounted in the socket the member 6 is screwthreadcd into the cone4 ductor member 5 and the spring 7 pressed against the end contact 17 of the lamp,

which pressure maintains the 'contact 16 los` -tA to position the lamp angularly of its axis, and the contact 16 serves to center the lamp in the bore of the body 2, the bore of the body and the conducting member 5 permitting movement of the contact member 16 into and out of the bore of the body in the removal and installation of the lamp.

It will be observed that in the use of the lamp and socket of my invention in conjunction with a lamp chamber as shown it is unnecessary to have access into the chamber foi removal of the 1am and that it is not necessary to grasp the ody of the lamp in the installation or removal of the lamp.

It will be further observed that the structure is quite simple and that it is adapted for the accurate positioning of the lamp mounted in the socket, which accurate positioning of the lamp is of advantage in the use of concentrated filament lamps for purposes requiring a definite and accurate location of thesource of light.

The Contact 16 of the lamp, as shown, is part of the adapter of my invention constructed and secured to a usual screw base of the lamp as will now be described. See

Figs. 1 and 3. The adapter comprises an annular metallic member lia-ving a'flat annular portion forming the contact 16, hereinabove mentioned, and a cylindrical portion 21 extending in one direction from the inner edge Vof the portion 16 and terminating at the free end thereof in'spaced lugs 22. The adapter is adapted to be placed over the usual metal cylindrical screwthreaded contact 23 of the lamp base and secured thereon in electrical communication therewith by soldering the lugs 22 to the contact 23, as findicated at 24.

While I have herein shown andA particularly described the preferred embodiment of my invention I do not wish to be limited to the precise details of construction shown as changes may readily be made without departing from the spirit of my invention, but having thus described my invention, I claim as new and desire to secure by Letters Patent the following 1. `An incandescent electric lamp socket adapted to have an incandescent electric lamp installed therein through the bottomA thereof including a. downwardly facing con ductive contact adapted to have the body of the lamp passed by the same and to have an upwardly facing contact of the base of the lamp engaged against the same, and a conductive end contact removably mounted on the socket and adapted for contacting an end contact of the lamp base for holding the lamp in the socket with said irst mentioned contact in contact with the second mentioned Contact, the removal of said third mentioned contact permitting installationand removal of the lamp.

2. An incandescent electric lamp socket adapted to have an incandescent electriclamp installed therein through the bottom thereof including a downwardly facing annular conductive contact adapted to have the p body of a lamp passed upwardly through the same and to have an upwardly facing circumferential contact of the base of the lamp .tion and removal of the lamp through the bottom of the socket.

3. An incandescent electric lamp socket adapted to have an incandescent electric lamp installed therein throu h the bottom thereof includinga downwar ly facing conductive contact adapted to have the body of the lamp passed by the same and to have an upwardly facing contact of the base of the lamp engaged against the same, a conductive terminal member secured with the first mentioned contact and insulated therefrom, and a conductive end Contact removably mounted in electrical contact with said terminal member and adapted `for contacting an end contact of the lamp base and securing the lamp base in the socket with the upwardly facing contact of the lamp basein contact with the first mentioned contact, the removal of said third mentioned Contact permitting installation and removal of the lamp through the bottom of the socket.

4. An incandescent electric lamp socket' adapted to have an incandescent electric lamp installed therein through the bot-tom thereof including an annular downwardly facing conductive contact adapted to have the body of a lamp passed upwardly therethrough and to have .an upwardly facing circumferential contact of the lamp base engaged against the same, an annular conductive member secured with said first mentioned contact and insulated therefrom and adapted to have the body of the lamp passed upwardly therethrough, and a conductive end contact screwthreaded on said last mentioned member for removal and adapted for contacting an end contact of the lamp base Vand securing the lamp base in the socket including a body of insulating lmaterial hav- 4ing a-bore therethrough, a downwardly facing conductive contact mounted on the body and adapted to permit the passage of the body of-a lamp upwardly through the bore of the body and to have au upwardly acing contact of the base of the lamp engaged against the same, and a conductive end contact removably secured with the body and insulated from the first mentioned contact and adapted for contacting an end contact of the lamp base for holding the lamp in the socket with the first mentioned contact in contact with the second mentioned contact, the removal of said third mentioned contact permitting installation and removal of the lamp.

6. An incandescent electric lamp socket including a body of insulating material hav- -ing a bore therethrough, a downwardly facing annular conductive contact mounted on the body and adapted to have the body of a lamp passed upwardly through the bore of theibody and through the opening of this contact and to have an upwardly facing contact of the base of the lamp engaged against the same, andv a. conductive end contactremovably secured with the body and insulated from the first mentioned'v contact an adapted for contacting an end coutl1 "t lamp base for holding the'lamp in thc socket with the first mentioned contact in contact with the second mentioned contact, the removal of said third mentionedcontact permitting installation and removal of the lamp.

7. An incandescent electric lamp socket including a body of insulating material having a bore therethrough, adownwardly facing annular conductive contact mounted onthe body and adapted to have the body of a lamp passed upwardly through the bore of the body and through the opening of this contact and to have -an upwardly facing contact of the base of the lamp engaged a"" the same, an annular conductive member mounted on the body and insulated from' the firstl mentioned contact and adapted to have Athe body ofthe lamp passed upwardly therethrough, and a conductive end contact removably secured in contact with said :in-

-lation andremova-l of the lamp.

8. An incandescent electric lamp socket including a body of insulating material having a bore therethrough, a downwardly facing annular conductive contact mounted on thebody and adapted toY have the body of la lamp passed upwardly through the bore of the body and through the opening of this 'contact and to have an upwardly facing conthe body and disposed below and insulated from tl'e first mentionedcontact and adapted to have the body ofthe lamp passed upwardly therethrough, and an external screwthreaded conductive end contact rcmovably screwthreaded into said annular conductive member and adapted for contact-l 'nfr an end -contact of the lamp base for oding the lamp in thc socket with the first mentioned contact in contact with the second mentioned contact, removal of said third mentioned contact permitting installation and removal of the 1am 9. An incandescent electric lamp socket including a bod of molded insulating material having a ore therethrough, a downwardly facing annular conductive contact molded in the body and adapted to have the body of a lamp assed upwardly through the bore of the bo y and through the opening of this contact and to have an upwardly facin contact of the base of the lamp engage against the same, an annular conductive member molded in the body and disposed below and insulated from the first mentioned contact and adapted to have the body of the lamp passed upwardlytherethrough, and a conductive end contactremovably secured in contact with said annular conductive member and adapted for contactingan end contact of the lamp base for holding the lamp in the socket with the first mentioned contact in contact with the second mentioned contact, ,removal of said third mentioned contact permitting installation and removal of the lamp.

10. An incandescent electric lamp socket including a bod of molded insulating material having a i re therethrough, a downwardly facing annular conductive contact molded in the body and adapted to have the body of a lam 'passed upwardly through the bore of the ody and through the opening of this contact and to have an upwardly facing contact of the base of the lamp engaged against the same, said first mentioned contact being provided with an extension extending through thebody to an externally exposed point and forming a terminal, an annular internally screwthreaded conductive member molded in the body and disposed belowand insulated from the first mentioned contact and adapted to have the body of the lamp passed upwardly therethrough, said annular conductive member being provided with an extension extending through the body to an externallyexposed point'and forming a terminal, and an externally screwthreaded conductive end contact screwthreaded into said annular conductive member and adapted for contacting' an end contact ofthe lamp base for lll) holding the lamp in the socket with the first mentioned contact in contact with the seeond mentioned contact, removal of said' third mentioned contact permitting installation and removal of the lamp.

11. An incandescent electric lainpprovided with a base includin a circumferential upwardly facing conductive contact disposed in a plane normal to the axis of the base and extending laterally beyond the body of the lamp and provided at its outer edge with an upwardly extending lug, and a centrally disposed conductive end contact insulated from the first mentioned contact.

In witness whereofl I hereunto aiiix my signature this 20th day of February, 1923. ALBERT S. HOWELL. 

